Where does “二次元” come from?

二次元 (Japanese) comes from Japanese 二, from Middle Chinese 二 — two.

二次元 (Japanese): the second dimension; the 2D world; the...

Definitions

  1. the second dimension; the 2D world; the...

Ancestry of “二次元”, step by step

二次元 traces back through two separate lines of ancestry.

via Japanese 二

StepLanguageWordMeaning
1Japanese二two, 2; second; two
2Middle Chinese二two

via Japanese 次元

StepLanguageWordMeaning
1Japanese次元a dimension

Words derived from “二次元”

Every word from Middle Chinese 二 →Every word from Japanese 二 →